Question

我希望将PHP中的长整数缩短为字符串，方法与十六进制的工作方式相同。我认为Google也会在YouTube上使用此类网址。

我想要使用一串数字和字母： 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ

其中：

8 = 8
a = 10
f = 15
Z = 61
10 = 62
11 = 63
1a = 72
and zo on...

目的是在affiliate url subid的参数中设置一个整数，用于跟踪。

Answer 1

我正在寻找一个好名字来描述我的问题我发现有一个六十进制数字系统以其为基础。

在这里你可以找到一个缩短网址的函数，避免类似字符（如0 / o和i / 1 / l / L等）之间的混合。

<?php
/**
 * A pure PHP implementation of NewBase60. A base 60 numbering system designed for 
 * use with URL shortening. Limited/overlapping character set to avoid confusion
 * between similar characters, eg o/0, i/l, etc.
 *
 * Q: Why not use PHP base_convert()?
 * A: Because it only goes up to base 36, and doesn't support the  NewBase60
 *
 * @see http://tantek.pbworks.com/w/page/19402946/NewBase60
 * @see http://en.wikipedia.org/wiki/sexagesimal
 *
 * @author david@dsingleton.co.uk
 */
class NewBase60
{
protected static $characterSet =  '0123456789ABCDEFGHJKLMNPQRSTUVWXYZ_abcdefghijkmnopqrstuvwxyz';

/**
 * Convert a sexagesimal number to a decimal number
 * @param string sexagesimal number to convert
 * @return integer Decimal representation of sexagesimal number
 */
public static function toDecimal($sexNum)
{
    // Return falsy and 0 values as is
    if (!$sexNum) {
        return $sexNum === '0' ? 0 : $sexNum;
    }

    $decNum = 0;

    foreach(str_split($sexNum) as $chr) {

        $ord = ord($chr);

        if ($ord>=48 && $ord<=57)       { $ord -= 48; } // 0 - 9
        elseif ($ord>=65 && $ord<=72)   { $ord -= 55; } // A - H
        elseif ($ord==73 || $ord==108)  { $ord =  1; }  // Error correct typo: capital I, lowercase l to 1
        elseif ($ord>=74 && $ord<=78)   { $ord -= 56; } // J - N
        elseif ($ord==79)               { $ord =  0; }  // Error correct typo: capital O to 0
        elseif ($ord>=80 && $ord<=90)   { $ord -= 57; } // P - Z
        elseif ($ord==95)               { $ord =  34; } // underscore
        elseif ($ord>=97 && $ord<=107)  { $ord -= 62; } // a - k
        elseif ($ord>=109 && $ord<=122) { $ord -= 63; } // m - z
        else { $ord = 0; }                              // treat all other noise as 0
        $decNum = 60 *$decNum + $ord;
    }

    return $decNum;
}

/**
 * Convert a decimal number to a sexagesimal number
 * @param integer Decimal number to convert
 * @return string sexagesimal representation of decimal
 */
public static function fromDecimal($decNum)
{
    $decNum = (int) $decNum;

    if (!$decNum) {
        return $decNum === 0 ? '0' : $sexNum;
    }

    $aSexCharset = self::$characterSet;
    $result = '';
    while ($decNum > 0) {
      $decRemainder = $decNum % 60;
      $decNum = ($decNum - $decRemainder) / 60;
      $result = $aSexCharset[$decRemainder] . $result;
    }

    return $result;
}
}

版权：https://github.com/dsingleton/new-base-60/blob/master/newbase60.class.php

在PHP中将整数更改为短字符串

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